they only go 7 mph
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640 acres = 1 square mile555 acres = 0.8672 square mile (rounded)
ca as an abbreviation related to time, means about. e.g. ca 1800 = about 1800
No math is not compulsory for CA.
The full form of "Ca" can be Canada, California, or Cocaine Anonymous. Ca is an abbreviation, or an acronym. An acronym is when the first letter of several words are used to shorten the pronunciation, for example, CA rather than Cocaine Anonymous.
If its a right triangle, use SoH CaH Toah, or Sine = opposite over hypotenuse, Cosine = adjacent over hypotenuse, and tangent = opposite over the adjacent. So, to solve your problem, if "c" is the right angle, Tan(a) = bc/ca or Tan(30)=5/ca or .577 = 5/ca or (.577)*ca = 5 or ca=5/(.577) or ca= 8.66